Restart your Mac, hold Cmd+R to enter Recovery Mode. Use Disk Utility to run First Aid on your startup disk. Then try the installer again.
Ensure you have at least 15GB to 20GB of free storage space on your primary drive.
Before starting, ensure your Mac model supports macOS Catalina. Generally, models from mid-2012 or later are compatible. : Early 2015 or newer MacBook Air / Pro : Mid 2012 or newer Mac mini / iMac : Late 2012 or newer : Late 2013 or newer System Requirements : At least 4GB of RAM and 12.5GB of available storage. Apple Support 2. Prepare for the Update Back Up Your Data Time Machine or an external drive to back up your entire system. Check for 32-bit Apps : macOS Catalina only supports 64-bit apps . Use the free utility
You need at least for the download and installation process.
macOS Catalina dropped support for many older Macs because it demands robust graphics capabilities. Before doing anything else, you must verify that your specific Apple computer model is supported by this operating system. Compatible Mac Models for macOS Catalina Early 2015 or newer MacBook Air: Mid 2012 or newer MacBook Pro: Mid 2012 or newer Mac mini: Late 2012 or newer iMac: Late 2012 or newer iMac Pro: 2017 or newer Mac Pro: Late 2013 or newer How to Check Your Model Click the Apple icon in the top-left corner of your screen. Select About This Mac . how to update macos high sierra 10136 to 1015
Wait for the list to load, then click the column to sort the apps.
Common issues and fixes
This report outlines the necessary steps, prerequisites, and important warnings regarding the upgrade from macOS High Sierra (10.13.6) to macOS Catalina (10.15).
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Upgrading from macOS High Sierra (10.13.6) to macOS Catalina (10.15) is a major transition. This jump moves your Mac from a 32-bit software ecosystem to a strictly 64-bit environment. Making this change requires careful preparation to ensure your data stays safe and your apps continue to function.
This link will trigger a hidden page inside your Mac App Store. Click .
Upgrading across three major versions (10.13 → 10.15) carries risks. Follow these steps strictly.
Before starting, ensure your Mac model officially supports macOS Catalina. Generally, if your Mac can run macOS Mojave, it can also run Catalina. The official compatibility list includes: Restart your Mac, hold Cmd+R to enter Recovery Mode
Before any major OS upgrade, use Time Machine to back up your data to an external drive. Updates can fail, and data loss is a real risk.
Catalina is the first macOS version to .
Recommendation
Transitioning from 10.13 to 10.15 changes system files, user permissions, and the underlying disk structure. A failed update can result in data loss. Therefore, you must perform a full to an external drive. For additional safety, consider cloning your startup disk using software like Carbon Copy Cloner. Crucially, do not skip this step; Catalina converts the system volume to a cryptographically signed, read-only “Signed System Volume,” and while this usually works seamlessly, reverting is difficult without a backup. Ensure you have at least 15GB to 20GB